Cast cutter



()Ct. 16, 1951 M, BOYER 2,571,527

CAST CUTTER Filed Oct. 15, 1947 Im'enlor Mari/n Boyer Patentecl Oct. 16,1951 UNITED STATES PATENT OFFICE" Martin Boyer, Lowry, Minn.,assignor'of one-third to Birth A. McIver, LQwry, -Minn.

Application October 15, 1947', Serial No. 779,956

2. Claims.

This invention appertains to novel and useful improvements inimplementsutilized for-specificpurpo'ses and relates particularlytoa-device for cutting a cast normally-used in association with certaininjuries.

An object of this inventionis to simply and easily cut'a' cast.

Another purpose of this invention is to provide means for cutting a castaxially thereof.

Another object of this invention is to provide improved means forprotecting the pertinent portion of the anatomy during the cuttingoperation.

Another purpose of this invention is to provide a guard adjacent thecutting means used in the present invention.

Another purpose of this invention is to provide means for adjusting theabove mentioned protecting means.

A still further object of this invention is to provide lubricantreceiving passages to insure high efliciency and to deter friction.

Ancillary objects and features of novelty will become apparent to thoseskilled in the art, and following the description of the preferred formof the invention, illustrated in the accompanying drawing, wherein:

Figure 1 is an elevational side view of the preferred form of theinvention;

Figure 2 is a plan View of the invention shown in Figure 1;

Figure 3 is a perspective view of a portion of the frame, illustratingparticularly the bifurcations thereof and the bearing block utilized inassociation therewith;

Figure 4 is a perspective view of the shaft to be placed in the bore ofthe bearing block, and;

Figure 5 is a perspective view of the guard used for protecting theanatomy during the cutting operations.

Referring now in detail to the illustrated preferred form of theinvention, reference is made primarily to Figure 2 and Figure 1 whereinthe frame member to is disposed with a suitable handle I2 integraltherewith and forminga portion thereof. The end opposite the said handle[2 is bifurcated, the bifurcations l4 and I6 composing thisconstruction.

The ends of the said bifurcations I4 and I6 are again bifurcated as seenin Figure 3, and as indicated at It and 26, 22 and 24 to form bearingblock receiving members. A bearing block 26 is positioned within thesaid bifurcations I8, 20, 22 and 24 and a bore 28 extends therethrough.

A shaft 38 is positioned in the said bore 28 and has threads at oneterminal portion thereof. A

pair of-nuts 32 and- 34 respectively or'th'e equivalents carrymeanswhich'is supplied on-the said threaded portion of the shaft 38forreceiving'a' cutting disk 36 therebetween. This cutting disk hasteeth about the periphery-thereof forengagement with a cast. Meansforlubricating the said shaft 30 is provided. This means may be seen asthe passages 38 and 46 respectively provided in the said bearing block26, the passages communicating with the said bore 28. Obviously, anysuitable lubricant may be supplied in the said passages therebydeterring or inhibiting friction to a substantial degree.

An arcuate rod 42 is secured to the said frame l6 and has a baffle 44associated therewith. This bafile is obviously used for the purpose ofdefiecting cut material and for protection of the operator of theinvention.

A slot 46 is also provided in the said frame II] for the purpose ofreceiving an arm 48 therein. This arm 48 has a plurality of apertures 56therein which are selectively positionable in alignment with a bore 52,communicating with the said slot 46. A pin or the like 54 may beextended through the said bore 52 and through a selected aperture 50,thereby adjusting the effective length of the said arm 48. A guard 56may be rigidly secured to the said arm 48, said guard being engageablewith a portion of the anatomy beneath the cast to be cut. Of course, byadjusting the arm 48, the distance between the bottom portion of thecutter 36 and the upper surface of the said guard 56 may be regulated inaccordance with the thickness of cast to be cut.

To assist in retaining the said shaft 38 in the said bore 28, a thrustbearing 58 may be supplied opposite the said nuts and a suitable setscrew or the like may be used in association therewith for retentionpurposes. The operation of the invention is deemed quite apparent. Thecast to be cut is simply held firmly and the guard 56 insertedthereunder. The handle I2 is then grasped and the device urged forward,thereby rotating the cutter 36 and making an incision in the said cast.The guard 56 protects the anatomy of the individual during this cuttingoperation and the baffle 44 may be employed for parting the cast afterthe cast has been cut.

Casts of varying thicknesses may be efiicaciously cut by use of thepresent invention, by simple manipulation of the pin 54 as describedabove.

Due to the extreme simplicity achieved by the present invention afurther description thereof is deemed unnecessary. However, it isapparthe furcations, a bearing block having its ends fitted within thebearing receiving members, the bearing block being provided with a bore,a shaft disposed in said bore, a freely rotating cutting means securedto one end of said shaft and being rotatably responsive to movement overthe cast, a guard provided below said cutting means and adjustablysecured to the frame, and a baflle secured to said frame substantiallyopposite said guard and above said cutting means.

2. A cast cutter comprising a frame, said frame formed with a handle atone end thereof and having planar furcations at its other end, saidfurcations forming extensions of said frame, substantially U-shapedbearing block receiving members formed at the outer end portions of thefurcations, a bearing block having its ends fitted within the bearingreceiving members, the bearing block being provided with a bore, 'saidbore extending transversely of the frame, a shaft disposed in said bore,cutting means secured to one end of said shaft, a guard provided belowsaid cutting means and adjustably secured to the frame, a bafliedisposed opposite said guard above said cutting means, said frame havingan opening therein intermediate its ends, an arm secured to said guardwith a plurality of apertures therein, said arm being passed throughsaid opening, and a pin carried by said frame and disposed in a selectedone of said apertures to thereby adjustably support said guard.

MARTIN BOYER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS w we r

